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Related Experiment Videos

Dynamic echo planar imaging of exercised muscle

R P Kennan1, T B Price, J C Gore

  • 1Yale University School of Medicine, Department of Diagnostic Radiology, New Haven, CT 06510, USA.

Magnetic Resonance Imaging
|January 1, 1995
PubMed
Summary

Dynamic changes in muscle relaxation rates were measured using echo planar imaging during exercise. A novel finding revealed a continued decrease in relaxation rates post-exercise, possibly due to increased blood flow.

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Area of Science:

  • Biomedical Engineering
  • Physiology
  • Magnetic Resonance Imaging

Background:

  • Muscle exercise induces physiological changes detectable by MRI.
  • Transverse relaxation rates (R2) reflect tissue water environment.
  • Previous studies lacked high temporal resolution to observe rapid post-exercise changes.

Purpose of the Study:

  • To investigate dynamic changes in anterior tibialis muscle R2 during exercise and recovery using high temporal resolution.
  • To characterize the post-exercise relaxation rate behavior.
  • To validate findings against lower temporal resolution T2 measurements.

Main Methods:

  • Utilized echo planar imaging with a single spin-echo technique for rapid R2 measurements (4s resolution).
  • Recorded R2 changes in the anterior tibialis muscle during dorsi-flexion exercise and 5-minute recovery.

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  • Compared results with multiple echo T2 measurements.

    • Main Results:

    • Observed an average decrease in delta R2 of 8.7 s-1 during exercise.
    • Demonstrated a consistent post-exercise 'undershoot' in delta R2, reaching a minimum ~1 minute after cessation.
    • Quantified exercise and undershoot rates as delta R2/delta t(ex) = -0.061 s-2 and delta R2/delta t(us) = -0.035 s-2, respectively.

    Conclusions:

    • High temporal resolution MRI reveals a previously unobserved post-exercise relaxation rate decrease in muscle.
    • This phenomenon may be attributed to increased tissue perfusion during muscle fiber relaxation.
    • Results are interpretable via fast or slow water exchange models, suggesting changes in net water or intracellular volume.